Water is necessary for carrying nutrients to your cells, flushing bacteria from your system, preventing dehydration, and replacing fluids lost from sweating, but you may not need to drink as much as you thought.
Stephen R. Daniels. pediatrician. No. You shouldn't give your newborn water or sugar water. And if you're feeding powdered or concentrated formula to your baby, never dilute it with more than the amount of water called for on the label. Your infant will get all the necessary hydration from breast milk or formula.
Once your baby is six months old, you can begin giving water in small amounts. This is the time when you introduce solid foods, and also when she gets more active. You can also offer diluted form of fruit juices (1:10 of juice and water), but not soda or other sugar drinks.